Front Mission 3 for the original playstation, was a terrific turn based strategy wargame. You control a group of 3 to 4 mecha, that you can upgrade or even replace completely with captured units. Not to mention being able to build a mech almost completely from scratch.
If you are feeling a bit more adventurous. The SD Gundam G-Generation from Japan games are terrific TBS games. However, you do need at a minimum some knowledge of Gundam and the mecha, plus you will need some sort of mod to enable you to play foreign games. There are however some great guides on how to play them available online. Recently a version has been released for the GBA and they can apparently play foreign games with out mods.
Lastly if you can find it there is a game called Neo-Nectaris for the PSX which is an updated version of the classic Military Madness.
If you are feeling a bit more adventurous. The SD Gundam G-Generation from Japan games are terrific TBS games. However, you do need at a minimum some knowledge of Gundam and the mecha, plus you will need some sort of mod to enable you to play foreign games. There are however some great guides on how to play them available online. Recently a version has been released for the GBA and they can apparently play foreign games with out mods.
Lastly if you can find it there is a game called Neo-Nectaris for the PSX which is an updated version of the classic Military Madness.